Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F212/02—Monomers containing only one unsaturated aliphatic radical
  • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F212/06—Hydrocarbons
  • C08F212/08—Styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
  • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
  • C08L33/12—Homopolymers or copolymers of methyl methacrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
  • C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
  • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/08—Copolymers of styrene
  • C08L25/12—Copolymers of styrene with unsaturated nitriles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/08—Copolymers of styrene
  • C08L25/14—Copolymers of styrene with unsaturated esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
  • C09D151/003—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
  • C09D151/04—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to rubbers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
  • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Definitions

• the present invention relates to a thermoplastic resin composition, and more particularly, to a thermoplastic resin composition which has improved properties in terms of elongation, processability, weather resistance, colorability, chemical resistance, scratch resistance, a whitening phenomenon, surface gloss and appearance quality.
• a polymer-coated metal (PCM) is generally used at present for the purpose of preventing corrosion, reducing friction, and providing surface gloss.
• PCMs polymer-coated metal
• VCM vinyl-coated metal
• a VCM is a material that includes a galvanized steel plate and PVC and PET film coatings applied thereon, and is used as an outer plate material for home appliances. Further, a VCM can be used for building materials, furniture, automobiles, electrical materials, roof tiles and the like.
• an acrylonitrile-styrene-acrylate (ASA) graft copolymer having excellent weather resistance can be an alternative.
• ASA graft copolymers an acryl-based rubber polymer is mainly used as a core for improving impact resistance, and styrene, acrylonitrile, methyl methacrylate and the like are used as a shell for improving colorability and dispersibility in a matrix copolymer.
• an ASA graft copolymer For application to a VCM, an ASA graft copolymer should have high elongation to prevent tearing during press forming of the sheet metal and be able to exhibit excellent surface quality even when processed at high temperature.
• thermoplastic resin composition that includes an ASA graft copolymer having high elongation and not generating bubbles even when processed at high temperature.
• the present invention is directed to providing a thermoplastic resin composition having improved properties in terms of elongation, processability, weather resistance, colorability, chemical resistance, scratch resistance, a whitening phenomenon, surface gloss and appearance quality while maintaining basic properties such as impact resistance, hardness and the like.
• thermoplastic resin composition which includes: a graft copolymer prepared by graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyan-based monomer onto an acrylic rubber polymer having an average particle diameter of 50.0 to 90.0 nm; a matrix copolymer including a C 1 -C 3 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit; and an additive including a polymer including a C 1 -C 3 alkyl (meth)acrylate-based monomer unit.
• thermoplastic resin composition of the present invention can exhibit significantly improved properties in terms of elongation, processability, weather resistance, colorability, chemical resistance, scratch resistance, a whitening phenomenon, surface gloss and appearance quality while having excellent basic properties such as impact resistance, hardness and the like.
• the average particle diameters of a seed, a core, an acrylic rubber polymer and a graft copolymer may be measured by a dynamic light scattering method, more specifically using a Nicomp 380 HPL instrument (manufactured by Nicomp).
• an average particle diameter may refer to an arithmetic average particle diameter in the particle size distribution as measured by a dynamic light scattering method, that is, an average particle diameter in the scattering intensity distribution.
• a degree of grafting for a graft copolymer may be calculated by the following equation.
• Weight of grafted monomers (g): Weight of insoluble material (gel) obtained after 1 g of graft copolymer is dissolved in 30 g of acetone and centrifuged
• Weight of acrylic rubber polymer (g): Theoretical weight of C 4 -C 10 alkyl (meth)acrylate-based monomer in graft copolymer powder, or weight of C 4 -C 10 alkyl (meth)acrylate-based monomer added in preparation of graft copolymer
• the weight-average molecular weight of a shell of a graft copolymer may refer to the weight-average molecular weight of a copolymer which includes an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit that are graft-polymerized onto an acrylic rubber polymer.
• the weight-average molecular weight of a shell of a graft copolymer may be measured as a relative value with respect to a standard polystyrene (PS) sample by gel permeation chromatography after dissolving, in a tetrahydrofuran solution, the portion (sol) that has been dissolved in acetone for measuring a degree of grafting.
• PS polystyrene
• the weight-average molecular weight of a matrix copolymer may be measured as a relative value with respect to a standard poly(methyl methacrylate) sample manufactured by Polymer Laboratories Ltd. by gel permeation chromatography, using tetrahydrofuran as an eluent.
• the polymerization conversion rate of a matrix copolymer may be calculated by the following equation.
• Polymerization conversion rate (%) ⁇ (Weight of solid content of actually obtained copolymer)/(Weight of prescriptively added monomers) ⁇ 100
• the weight-average molecular weight of a polymer included in an additive may be measured as a relative value with respect to a standard poly(methyl methacrylate) sample (manufactured by Polymer Laboratories Ltd.) by gel permeation chromatography, using tetrahydrofuran as an eluent.
• the polymerization conversion rate of a polymer included in an additive may be determined by extracting residual monomer components from the polymer by a reprecipitation method using chloroform (CHCl 3 ) and methanol and then quantitatively analyzing the same using a gas chromatography-mass spectrometry (GC-MSD).
• CHCl 3 chloroform
• GC-MSD gas chromatography-mass spectrometry
• polymer should be understood as encompassing both a homopolymer which is formed by polymerizing one type of monomer and a copolymer which is formed by polymerizing two or more types of monomers.
• an aromatic vinyl-based monomer unit may be a unit derived from an aromatic vinyl-based monomer, and the aromatic vinyl-based monomer may be one or more selected from the group consisting of styrene, ⁇ -methylstyrene, p-methylstyrene, 2,4-dimethylstyrene and vinyl toluene, and is preferably styrene.
• a vinyl cyan-based monomer unit may be a unit derived from a vinyl cyan-based monomer, and the vinyl cyan-based monomer may be one or more selected from the group consisting of acrylonitrile, methacrylonitrile and ethacrylonitrile, and is preferably acrylonitrile.
• a C 1 -C 3 alkyl (meth)acrylate-based monomer unit may be a unit derived from a C 1 -C 3 alkyl (meth)acrylate-based monomer, and the C 1 -C 3 alkyl (meth)acrylate-based monomer may be one or more selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate and propyl (meth)acrylate, and is preferably one or more selected from the group consisting of methyl methacrylate and methyl acrylate.
• the thermoplastic resin composition according to one embodiment of the present invention includes: 1) a graft copolymer prepared by graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyan-based monomer onto an acrylic rubber polymer having an average particle diameter of 50.0 to 90.0 nm; 2) a matrix copolymer including a C 1 -C 3 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit; and 3) an additive including a polymer including a C 1 -C 3 alkyl (meth)acrylate-based monomer unit.
• thermoplastic resin composition according to one embodiment of the present invention will be described in detail.
• the graft copolymer is prepared by graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyan-based monomer onto an acrylic rubber polymer having an average particle diameter of 50.0 to 90.0 nm.
• the graft copolymer may serve to improve the weather resistance, elongation, colorability, chemical resistance, processability, surface gloss characteristics and whitening properties of the thermoplastic resin composition.
• the acrylic rubber polymer may have an average particle diameter of 50.0 to 90.0 nm, preferably 65.0 to 75.0 nm.
• the weather resistance of the acrylic rubber polymer can be improved because a specific surface area increases as an average particle diameter decreases.
• the acrylic rubber polymer allows visible light to pass therethrough, colorability can be significantly improved.
• a large amount of the graft copolymer can be uniformly dispersed in the thermoplastic resin composition, elongation and whitening properties can be significantly improved. Below the above-described range, impact strength may be significantly lowered, and above the above-described range, whitening properties may be significantly degraded.
• the graft copolymer may be a copolymer prepared by graft-polymerizing styrene and acrylonitrile onto a butyl acrylate rubber polymer.
• the graft copolymer may have a degree of grafting of 25 to 50% or 30 to 45%, preferably 30 to 45%.
• a degree of grafting of 25 to 50% or 30 to 45%, preferably 30 to 45%.
• the graft copolymer may have a shell having a weight-average molecular weight of 30,000 to 200,000 g/mol, 50,000 to 180,000 g/mol or 80,000 to 150,000 g/mol, preferably 80,000 to 150,000 g/mol.
• the compatibility thereof with other components can be improved, and the dispersibility of the acrylic rubber polymer in the thermoplastic resin composition can be improved.
• the graft copolymer may be prepared by forming a seed by adding one or more selected from the group consisting of a C 4 -C 10 alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer and carrying out crosslinking, forming a core in the presence of the seed by adding a C 4 -C 10 alkyl (meth)acrylate-based monomer and carrying out crosslinking, and forming a shell in the presence of the core by adding an aromatic vinyl-based monomer and a vinyl cyan-based monomer and carrying out graft-polymerization.
• the core may refer to the above-described acrylic rubber polymer.
• the C 4 -C 10 alkyl (meth)acrylate-based monomer may be one or more selected from the group consisting of butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate and decyl (meth)acrylate, and is preferably butyl acrylate.
• the C 4 -C 10 alkyl (meth)acrylate-based monomer may be added in an amount of 30 to 50 wt % or 35 to 45 wt %, preferably 35 to 45 wt %, based on the total weight of the monomers added in the preparation of the graft copolymer.
• the weather resistance, impact resistance, surface gloss characteristics, elongation and whitening properties of the graft copolymer can be improved.
• the aromatic vinyl-based monomer may be added in an amount of 30 to 50 wt % or 35 to 45 wt %, preferably 35 to 45 wt %, based on the total weight of the monomers added in the preparation of the graft copolymer.
• the above-described range is satisfied, not only can the processability of the graft copolymer be improved, but also the graft copolymer can be more uniformly dispersed in the thermoplastic resin composition, and the colorability of the thermoplastic resin composition can be improved.
• the vinyl cyan-based monomer may be added in an amount of 10 to 30 wt % or 15 to 25 wt %, preferably 15 to 25 wt %, based on the total weight of the monomers added in the preparation of the graft copolymer.
• the above-described range is satisfied, not only can the chemical resistance of the graft copolymer be improved, but also the graft copolymer can be more uniformly dispersed in the thermoplastic resin composition, and the colorability of the thermoplastic resin composition can be improved.
• the total weight of the monomers added in the preparation of the seed may be 1 to 20 wt % or 5 to 15 wt %, preferably 5 to 15 wt %, based on the total weight of the monomers added in the preparation of the graft copolymer.
• the total weight of the monomers added in the preparation of the core may be 20 to 50 wt % or 25 to 45 wt %, preferably 25 to 45 wt %, based on the total weight of the monomers added in the preparation of the graft copolymer.
• the total weight of the monomers added in the preparation of the shell may be 40 to 70 wt % or 45 to 65 wt %, preferably 45 to 65 wt %, based on the total weight of the monomers added in the preparation of the graft copolymer.
• the graft copolymer may be included in an amount of 30 to 80 wt % or 35 to 75 wt %, preferably 35 to 75 wt %, based on the total weight of the thermoplastic resin composition.
• the elongation, weather resistance, chemical resistance, colorability, processability, surface gloss characteristics, appearance quality and whitening properties of the thermoplastic resin composition can be significantly improved.
• the matrix copolymer is a random copolymer, and includes a C 1 -C 3 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit.
• the matrix copolymer includes the C 1 -C 3 alkyl (meth)acrylate-based monomer unit, which is a component of the additive, and the aromatic vinyl-based monomer unit and the vinyl cyan-based monomer unit, which are components of the shell of the graft copolymer, the matrix copolymer not only can have excellent compatibility with the graft copolymer and the additive but also can allow the compatibility between the graft copolymer and the polymer to be improved. Therefore, the thermoplastic resin composition according to one embodiment of the present invention is not phase-separated even when molded at high temperature.
• the matrix copolymer may allow the colorability, weather resistance and hardness of the thermoplastic resin composition to be improved.
• the matrix copolymer may be a copolymer prepared using a monomer mixture including a C 1 -C 3 alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer.
• the monomer mixture may include the C 1 -C 3 alkyl (meth)acrylate-based monomer in an amount of 25 to 75 wt % or 30 to 70 wt %, preferably 30 to 70 wt %.
• the compatibility with a polymer included in the additive be significantly improved, but also the colorability, weather resistance and hardness of the thermoplastic resin composition can be significantly improved.
• the monomer mixture may include the aromatic vinyl-based monomer in an amount of 15 to 60 wt % or 20 to 55 wt %, preferably 20 to 55 wt %.
• the above-described range is satisfied, not only can the compatibility with the graft copolymer be significantly improved, but also the colorability, weather resistance and hardness of the thermoplastic resin composition can be significantly improved.
• the monomer mixture may include the vinyl cyan-based monomer in an amount of 1 to 20 wt % or 5 to 15 wt %, preferably 5 to 15 wt %.
• the compatibility with the graft copolymer be significantly improved, but also the colorability, weather resistance and hardness of the thermoplastic resin composition can be significantly improved.
• the matrix copolymer may be a copolymer of methyl methacrylate, styrene and acrylonitrile.
• the matrix copolymer may have a weight-average molecular weight of 50,000 to 200,000 g/mol, 60,000 to 170,000 g/mol or 70,000 to 140,000 g/mol, preferably 70,000 to 140,000 g/mol. When the above-described range is satisfied, the balance among processability, compatibility and hardness can be excellent.
• the matrix copolymer may be included in an amount of 0.1 to 30.0 wt % or 1.0 to 25.0 wt %, preferably 1.0 to 25.0 wt %, based on the total weight of the thermoplastic resin composition.
• the additive includes a polymer including a C 1 -C 3 alkyl (meth)acrylate-based monomer unit.
• the additive may allow the hardness, surface gloss, scratch resistance, appearance quality and weather resistance of the thermoplastic resin composition to be improved.
• the polymer may have a weight-average molecular weight of 150,000 to 250,000 g/mol, 170,000 to 230,000 g/mol or 190,000 to 210,000 g/mol, preferably 190,000 to 210,000 g/mol.
• a polymer-derived gas may not be generated and the polymer may not be decomposed during the processing of the thermoplastic resin composition.
• the hardness, weather resistance, surface gloss, scratch resistance and appearance quality of the thermoplastic resin composition can be significantly improved.
• the polymer may be poly(methyl methacrylate).
• the polymer may be a copolymer that includes two or more types of C 1 -C 3 alkyl (meth)acrylate-based monomer units, and is preferably a copolymer that includes a C 1 -C 3 alkyl methacrylate-based monomer unit and a C 1 -C 3 alkyl acrylate-based monomer unit.
• the copolymer may be a copolymer prepared using a monomer mixture including a C 1 -C 3 alkyl methacrylate-based monomer and a C 1 -C 3 alkyl acrylate-based monomer.
• the monomer mixture may include the C 1 -C 3 alkyl methacrylate-based monomer and the C 1 -C 3 alkyl acrylate-based monomer in a weight ratio of 80:20 to 99:1 or 85:15 to 95:5, preferably 85:15 to 95:5.
• the balance among processability, surface gloss, hardness and tensile strength can be excellent.
• the copolymer may be a copolymer of methyl methacrylate and methyl acrylate.
• the polymer may be included in an amount of 5 to 50 wt % or 10 to 45 wt %, preferably 10 to 45 wt %, based on the total weight of the thermoplastic resin composition.
• the hardness, weather resistance, surface gloss, scratch resistance and appearance quality of the thermoplastic resin composition can be significantly improved.
• Polymerization was carried out while continuously adding each of the following to the seed-containing reactor at 70° C. for three hours at a constant rate: a mixture including 30 parts by weight of butyl acrylate, 0.5 part by weight of sodium di-2-ethylhexyl sulfosuccinate as an emulsifier, 0.2 part by weight of ethylene glycol dimethacrylate as a crosslinking agent, 0.2 part by weight of allyl methacrylate as a grafting agent, 0.1 part by weight of NaHCO 3 as an electrolyte and 20 parts by weight of distilled water; and 0.06 part by weight of potassium persulfate as an initiator.
• the polymerization was continued for another hour and then terminated, and thereby a butyl acrylate rubber polymer (average particle diameter: 68.5 nm), which is a core, was obtained.
• Polymerization was carried out while continuously adding each of the following to the core-containing reactor at 70° C. for five hours at a constant rate: a mixture including 40 parts by weight of styrene, 20 parts by weight of acrylonitrile, 1.4 parts by weight of potassium rosinate as an emulsifier, 0.042 part by weight of KOH as an electrolyte, 0.05 part by weight of t-dodecyl mercaptan as a molecular-weight regulator and 63 parts by weight of distilled water; and 0.1 part by weight of potassium persulfate as an initiator. After the continuous addition was completed, the polymerization was continued at 70° C.
• the graft copolymer latex had a polymerization conversion rate of 98%, a pH of 9.5 and a degree of grafting of 42%.
• Polymerization was carried out while continuously adding, to the seed-containing reactor at 70° C. for three hours at a constant rate, a mixture including 40 parts by weight of butyl acrylate, 0.5 part by weight of sodium di-2-ethylhexyl sulfosuccinate as an emulsifier, 0.2 part by weight of ethylene glycol dimethacrylate as a crosslinking agent, 0.2 part by weight of allyl methacrylate as a grafting agent, 0.1 part by weight of NaHCO 3 as an electrolyte, 0.05 part by weight of potassium persulfate and 20 parts by weight of distilled water.
• the polymerization was continued for another hour and then terminated, and thereby a butyl acrylate rubber polymer (average particle diameter: 280.0 nm), which is a core, was obtained.
• Polymerization was carried out while continuously adding each of the following to the core-containing reactor at 70° C. for five hours at a constant rate: a mixture including 37.5 parts by weight of styrene, 12.5 parts by weight of acrylonitrile, 0.1 part by weight of potassium persulfate as an initiator, 1.5 parts by weight of potassium rosinate as an emulsifier, 0.05 part by weight of t-dodecyl mercaptan as a molecular-weight regulator and 63 parts by weight of distilled water; and 0.1 part by weight of potassium persulfate as an initiator. After the continuous addition was completed, the polymerization was continued at 75° C.
• the graft copolymer latex had a polymerization conversion rate of 98%, a pH of 9.5 and a degree of grafting of 38%.
• An activator solution including 0.015 part by weight of disodium ethylenediaminetetraacetate, 0.02 part by weight of sodium formaldehyde sulfoxylate, 0.001 part by weight of ferrous sulfate heptahydrate and 1.165 parts by weight of distilled water was prepared.
• a pre-emulsion was prepared by mixing 50 parts by weight of distilled water, 5 parts by weight of an aqueous sodium lauryl sulfate solution (concentration: 3 wt %), 21 parts by weight of methyl methacrylate, 36.75 parts by weight of styrene and 12.25 parts by weight of acrylonitrile and stabilizing the mixture.
• the pre-emulsion After raising the temperature of the reactor to 65° C., the pre-emulsion, 0.1 part by weight of an aqueous potassium persulfate solution (concentration: 3 wt %) as an initiator and 5 parts by weight of the activator solution were batch-added and polymerized for two hours, and thereby a polymer latex was prepared.
• the polymer latex had a polymerization conversion rate of 99%, an average particle diameter of 150.0 nm and a weight-average molecular weight of 80,000 g/mol.
• the polymer latex was cooled slowly at room temperature and then for eight hours at ⁇ 15° C.
• the cold copolymer latex was thawed at room temperature and was thereby separated into two phases, and the portion that settled at the bottom was collected.
• the collected portion was washed with distilled water and then dried in a vacuum oven for 24 hours to remove moisture and unreacted monomers therefrom, and thereby white, finely shaped particles were obtained.
• An activator solution including 0.015 part by weight of disodium ethylenediaminetetraacetate, 0.02 part by weight of sodium formaldehyde sulfoxylate, 0.001 part by weight of ferrous sulfate heptahydrate and 1.165 parts by weight of distilled water was prepared.
• a pre-emulsion was prepared by mixing 50 parts by weight of distilled water, 5 parts by weight of an aqueous sodium lauryl sulfate solution (concentration: 3 wt %), 49 parts by weight of methyl methacrylate, 15.75 parts by weight of styrene and 5.25 parts by weight of acrylonitrile and stabilizing the mixture.
• the pre-emulsion After raising the temperature of the reactor to 65° C., the pre-emulsion, 0.1 part by weight of an aqueous potassium persulfate solution (concentration: 3 wt %) as an initiator and 5 parts by weight of the activator solution were batch-added and polymerized for two hours, and thereby a polymer latex was prepared.
• the polymer latex had a polymerization conversion rate of 99%, an average particle diameter of 150.0 nm and a weight-average molecular weight of 80,000 g/mol.
• the polymer latex was cooled slowly at room temperature and then for eight hours at ⁇ 15° C.
• the cold copolymer latex was thawed at room temperature and was thereby separated into two phases, and the portion that settled at the bottom was collected.
• the collected portion was washed with distilled water and then dried in a vacuum oven for 24 hours to remove moisture and unreacted monomers therefrom, and thereby white, finely shaped particles were obtained.
• An activator solution including 0.015 part by weight of disodium ethylenediaminetetraacetate, 0.02 part by weight of sodium formaldehyde sulfoxylate, 0.001 part by weight of ferrous sulfate heptahydrate and 1.165 parts by weight of distilled water was prepared.
• a pre-emulsion was prepared by mixing 50 parts by weight of distilled water, 5 parts by weight of an aqueous sodium lauryl sulfate solution (concentration: 3 wt %), 10.5 parts by weight of methyl methacrylate, 44.63 parts by weight of styrene and 14.87 parts by weight of acrylonitrile and stabilizing the mixture.
• the pre-emulsion After raising the temperature of the reactor to 65° C., the pre-emulsion, 0.1 part by weight of an aqueous potassium persulfate solution (concentration: 3 wt %) as an initiator and 5 parts by weight of the activator solution were batch-added and polymerized for two hours, and thereby a polymer latex was prepared.
• the polymer latex had a polymerization conversion rate of 99%, an average particle diameter of 150.0 nm and a weight-average molecular weight of 80,000 g/mol.
• the polymer latex was cooled slowly at room temperature and then for eight hours at ⁇ 15° C.
• the cold copolymer latex was thawed at room temperature and was thereby separated into two phases, and the portion that settled at the bottom was collected.
• the collected portion was washed with distilled water and then dried in a vacuum oven for 24 hours to remove moisture and unreacted monomers therefrom, and thereby white, finely shaped particles were obtained.
• An activator solution including 0.015 part by weight of disodium ethylenediaminetetraacetate, 0.02 part by weight of sodium formaldehyde sulfoxylate, 0.001 part by weight of ferrous sulfate heptahydrate and 1.165 parts by weight of distilled water was prepared.
• a pre-emulsion was prepared by mixing 50 parts by weight of distilled water, 5 parts by weight of an aqueous sodium lauryl sulfate solution (concentration: 3 wt %), 59.5 parts by weight of methyl methacrylate, 7.88 parts by weight of styrene and 2.62 parts by weight of acrylonitrile and stabilizing the mixture.
• the pre-emulsion After raising the temperature of the reactor to 65° C., the pre-emulsion, 0.1 part by weight of an aqueous potassium persulfate solution (concentration: 3 wt %) as an initiator and 5 parts by weight of the activator solution were batch-added and polymerized for two hours, and thereby a polymer latex was prepared.
• the polymer latex had a polymerization conversion rate of 99%, an average particle diameter of 150.0 nm and a weight-average molecular weight of 80,000 g/mol.
• the polymer latex was cooled slowly at room temperature and then for eight hours at ⁇ 15° C.
• the cold copolymer latex was thawed at room temperature and was thereby separated into two phases, and the portion that settled at the bottom was collected.
• the collected portion was washed with distilled water and then dried in a vacuum oven for 24 hours to remove moisture and unreacted monomers therefrom, and thereby white, finely shaped particles were obtained.
• a first copolymer was prepared by carrying out polymerization at 140° C. while continuously adding a polymerization solution including 25 parts by weight of toluene, 75 parts by weight of styrene, 25 parts by weight of acrylonitrile, 0.02 part by weight of 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane as an initiator and 0.08 part by weight of n-dodecyl mercaptan as a molecular-weight regulator to a nitrogen-substituted 26-L first reactor at a rate of 14 L/hr for one hour, and a second copolymer was prepared by carrying out polymerization at 150° C.
• a polymerization solution including 25 parts by weight of toluene, 75 parts by weight of styrene, 25 parts by weight of acrylonitrile, 0.02 part by weight of 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane
• the obtained second copolymer was transferred to a volatilization tank where unreacted monomers and a reaction medium were removed at 215° C., and thereby a copolymer (weight-average molecular weight: 120,000 g/mol) in pellet form was obtained.
• thermoplastic resin compositions were mixed in contents shown in Table 1 to Table 3 and stirred to prepare thermoplastic resin compositions.
• Test specimens were prepared by extruding and injection-molding the thermoplastic resin compositions of Examples and Comparative Examples. The properties of the test specimens were evaluated by the methods described below, and the results are shown in Table 1 to Table 3.
• ⁇ circle around (4) ⁇ Weather resistance ( ⁇ E): evaluated under SAE J1960 conditions for 2,000 hours using an accelerated weather resistance testing instrument (Ci4000 Weather-Ometer manufactured by ATLAS, xenon-arc lamp, quartz (inner)/S.Boro (outer) filter, irradiance 0.55 W/m 2 at 340 nm).
• ⁇ E is an arithmetic average value obtained before and after the accelerated weather resistance test, and values close to 0 indicate better weather resistance.
• ⁇ E ⁇ square root over (( L′ ⁇ L 0 ) 2 +( a′ ⁇ a 0 ) 2 +( b′ ⁇ b 0 ) 2 ) ⁇
• L′, a′ and b′ are the L, a and b values measured in the CIE LAB color coordinate system after irradiating the test specimen with light under SAE J1960 conditions for 2,000 hours
• L 0 , a 0 and b 0 are the L, a and b values measured in the CIE LAB color coordinate system before the light irradiation.
• thermoplastic resin compositions of the Examples and Comparative Examples were formed into a sheet having a width of 10 cm and a thickness of 0.15 mm using a sheet extruder.
• the properties of the sheet were evaluated by the method described below, and the results are shown in Table 1 to Table 3.
• test specimen was prepared by attaching, at 200° C., the sheet prepared in Experimental Example 2 to a galvanized steel plate using an adhesive.
• the properties of the test specimen were evaluated by the methods described below, and the results are shown in Table 1 to Table 3.
• thermoplastic resin compositions of Examples 1 to 4 it was confirmed that the higher the content of the graft copolymer having a small particle diameter, the better the impact strength and elongation.
• thermoplastic resin compositions of Examples 2 to 4 it was confirmed that the higher the content of the matrix copolymer and the additive, the better the hardness, weather resistance and surface gloss.
• thermoplastic resin composition of Example 1 which included a matrix copolymer prepared to include methyl methacrylate in an amount of 30 parts by weight, had better impact strength, hardness, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Example 7 which included a matrix copolymer prepared to include methyl methacrylate in an amount of 15 parts by weight.
• thermoplastic resin composition of Example 1 which included a matrix copolymer prepared to include methyl methacrylate in an amount of 30 parts by weight, had better impact strength, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Example 8 which included a matrix copolymer prepared to include methyl methacrylate in an amount of 85 parts by weight. From these results, it was confirmed that when a matrix copolymer including an appropriate amount of methyl methacrylate was used, the compatibility with the graft copolymer and the additive was significantly improved, such that impact strength, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality were improved.
• thermoplastic resin composition of Example 1 which included a matrix copolymer, had better impact strength, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Comparative Example 4 which did not include a matrix copolymer.
• thermoplastic resin composition of Example 1 had considerably better impact strength, hardness, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Comparative Example 5 which included a styrene/acrylonitrile polymer as a matrix copolymer. From this result, it was confirmed that when a matrix copolymer including methyl methacrylate was used, the compatibility with the graft copolymer and the additive was significantly improved, such that impact strength, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality were significantly improved.
• Example 1 As a result of comparing Example 1 and Comparative Example 8, it was confirmed that the thermoplastic resin composition of Example 1 had considerably better impact strength, hardness, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than Comparative Example 8 which included the graft copolymer having a small particle diameter in an amount of 67 parts by weight and did not include the additive. From this result, it was confirmed that when a matrix copolymer including methyl methacrylate was used, the compatibility with the graft copolymer and the additive was significantly improved, such that impact strength, trimming ability, whitening resistance and surface gloss were improved even though the graft copolymer was included in a small amount.
• thermoplastic resin composition of Example 1 which included the graft copolymer having a small particle diameter, had a lower impact strength but considerably better weather resistance, whitening resistance and surface gloss than the thermoplastic resin composition of Comparative Example 9 which included the graft copolymer having a large particle diameter.
• thermoplastic resin composition of Example 2 which included a matrix copolymer prepared to include methyl methacrylate in an amount of 70 parts by weight, had better impact strength, elongation, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Example 6 which included a matrix copolymer including methyl methacrylate in an amount of 85 parts by weight.
• thermoplastic resin composition of Example 2 had better impact strength, hardness, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Comparative Example 6 which included a styrene/acrylonitrile polymer as a matrix copolymer.
• thermoplastic resin composition of Example 2 which included the graft copolymer having a small particle diameter, had a lower impact strength and lower elongation but considerably better weather resistance, whitening resistance and surface gloss than the thermoplastic resin composition of Comparative Example 10 which included the graft copolymer having a large particle diameter.
• thermoplastic resin composition of Example 2 had better impact strength, elongation, weather resistance, trimming ability, whitening resistance, surface gloss and appearance quality than the thermoplastic resin composition of Comparative Example 7 which did not include a matrix copolymer.
• thermoplastic resin composition of Example 5 which included a matrix copolymer in an amount of 20 parts by weight, had slightly better impact strength, weather resistance, trimming ability and surface gloss than the thermoplastic resin composition of Example 7 which included a matrix copolymer in an amount of 15 parts by weight.
• thermoplastic resin composition of Example 5 had better impact strength and trimming ability than the thermoplastic resin composition of Comparative Example 4 which did not include a matrix copolymer.
• thermoplastic resin composition of Comparative Example 1 which included an excessive amount of the graft copolymer having a large particle diameter, had better impact strength, elongation and trimming ability but lower weather resistance and lower surface gloss than the thermoplastic resin composition of Comparative Example 2.
• thermoplastic resin composition of Comparative Example 3 which further included the graft copolymer having a small particle diameter, had better elongation, weather resistance, whitening resistance and surface gloss than the thermoplastic resin composition of Comparative Example 1, but neither Comparative Example 1 nor Comparative Example 3 had excellent overall properties.

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